Optical Measuring Device Light Shielding for Ambient Noise Reduction
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Solution Overview
Problem
The triangular distance measuring method for shape measurement is hindered by ambient light noise, which degrades the accuracy of point cloud data, and existing solutions require costly darkroom setups or complex operations.
Innovation Solution
A measuring device with a stage holding unit, a head unit containing a light projecting and receiving unit, and a first light shielding member above the stage to block ambient light, allowing for oblique measurement light guidance and reduced noise without the need for a darkroom, along with optional additional light shielding members for further noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a darkroom is prepared to suppress ambient light incidence, then measurement precision is improved, but cost increases and ease of operation deteriorates
Solution Approach 1:
A light shielding member is introduced as an intermediary component between the ambient light environment and the measuring device. This member selectively blocks harmful ambient light while allowing the measuring device to operate in a normal room environment, thus improving measurement precision without requiring a darkroom setup or sacrificing operational ease
2Measurement precision
If a darkroom is prepared to suppress ambient light incidence, then measurement precision is improved, but cost increases
Solution Approach 1:
The light shielding member serves as a cost-effective intermediary solution that provides the necessary light isolation without requiring expensive darkroom construction. By placing this shielding member directly at the measurement location, the system achieves high measurement precision in a normal room environment, avoiding the high costs associated with building and maintaining a darkroom
Solution Approach 2:
Instead of creating an entirely new darkroom environment, the invention copies the essential light-blocking function at the specific measurement location using a localized shielding member. This approach achieves the same precision improvement as a full darkroom setup but with minimal cost and complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy measurements at a low cost by reducing ambient light noise, facilitating easy operation without the need for a darkroom and improving measurement precision.
Implementation Method 1
the light receiving unit receiving the measurement light reflected by the measuring object
Implementation Method 2
In a measuring device of a triangular distance measuring method, a surface of a measuring object is irradiated with light, and a light receiving element including pixels arrayed one-dimensionally or two-dimensionally receives the light reflected from the surface
Implementation Method 3
a first light shielding member that is provided above a space on the stage so as to block ambient light from above the space on the stage
Data Source
AI summary
Provided is a measuring device that can easily perform high-accuracy measurement at low cost. A stage is held on an installation part. A head unit including a light projecting unit and a light receiving unit, and the installation part are fixedly coupled together by a stand. A light shielding mechanism is attached to the stand in order to block ambient light. The light shielding mechanism includes a front cover member that covers a space on the stage from above. Point cloud data representing the three-dimensional shape of the measuring object is generated based on the light reception signal. Designation of a point to be measured in the measuring object is received, and a measurement value at the designated point is calculated based on the obtained point cloud data.